One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,7)(5,8)(9,13)(10,12)(11,14)(15,16)(17,18,23,26)(19,28,32,41)(20,33,37,44)(21,38,22,27)(24,31,40,30)(25,35,43,36)(29,46,47,39)(34,45,48,42)(4,11)(6,12)(7,14)(9,15)(17,19)(18,24)(20,34)(21,31)(22,30)(23,32)(25,42)(26,40)(27,41)(28,38)(29,35)(33,39)(36,47)(37,48)(43,45)(44,46) involution — undirected(1,3)(2,6)(4,9)(5,10)(7,13)(8,12)(11,15)(14,16)(17,20)(18,25)(19,29)(21,35)(22,36)(23,37)(24,39)(26,43)(27,44)(28,45)(30,34)(31,48)(32,47)(33,38)(40,46)(41,42) involution — undirected(1,4,5,11)(2,7,8,14)(3,9,10,15)(6,13,12,16)(18,26)(24,40)(25,43)(27,38)(28,41)(33,44)(39,46)(42,45)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.